SSM2211 Audio Amp Overheating in Digital AM/FMSW Receiver Build—Possible Causes?

Hi
I have a vain hope that someone other than myself, an elderly person still as fascinated by electronics as I was some 65 years ago will have attempted construction of the above project.
I enjoyed the researching the various components and with my old eyes managing to solder some very small components e.g. DAC8551IDGKT VSSOP-8.
Having completed the build I switched on with my usual low expectation level to find a rather crackly and weak signal but for a few seconds some recognisable words in english. The radio then proceeded to simply click and with display illuminated but without any script I decided to switch off and investigate. It was then I realised the IC1 SSM2211 Audio Power Amplifier was very hot. I measured it with my Fluke and switched off as the temp went past 100degC, I felt sure this was not good!
Having been meticulous in assembling what was described as 'easy to build' I am seeking help from anyone who might proffer some guidance as to how to proceeded with fault finding having already followed the limited suggestion.
Regards
Alan

I'm 72 and still going strong, doing contract electronics from home.
First thing I would do is make a close visual inspection, firstly, is the chip in the correct orientation, if not, see my comments further on about chip removal and getting a replacement. If the orientation is correct, make sure there are no solder bridges or a poor soldered connection on and between the smd pads. I use a stereo microscope, but lacking that a light and a magnifying glass (on some sort of stand so the PCB be be looked at easily from a number of angles can help) would do. A DVM on ohms may help as well, but the probe tips are often too large around SMD parts, so you need to move out to where other components are more accessible. If you find a problem, it will tell you that your soldering skills are not quite there yet, and that next time you need to do a good visual inspection before powering up the board again. If there were soldering issues, you could try cleaning them up and reapplying power to the board, but my guess is that you will have to remove the chip, since it seems likely that you may have exceeded to maximum junction temperature of the part, meaning total internal destruction. Look at YouTube clips on how to do that, it takes some care to avoid ripping smd pads off the pcb. A replacement part may be available from the Silicon Chip online shop, otherwise go to http://www.findchips.com/ and type in the part number in the search bar, making sure that you get the whole number which includes the package information, this is available from the data sheet.
Best I can advise on the strength of the information given,
cheers,
Richard

Thanks Richard, I have done a visual inspection using magnifying spectacles and cannot see any real soldering issues, also the orientation inspected and compared to schematic to verify connections.
I guess I shall have to try to replace the chip. I did consider the possibility of a faulty chip as it came from China but have no real reason to suspect that this source is unreliable.
The last radio I made many years ago (Sinclair Micro 6)with larger components was much easier to fault find but with modern IC’s I find the task quite daunting and challenging.
Kind regards
Alan just a tad older at 73 with birthday next month

Vast numbers of chips are fabricated in China for US design companies, but there are counterfeit problems associated with China as well. So chances are the part will be made in China, but if you source it from a reputable distributor outside of China you should be OK.
Re handling the parts, it is best to use ESD mitigation, despite the fact that many people handle parts without taking it into account, and you may handle hundreds of IC's without it being a problem, it can and does damage chips.
If you remove the part from the board, you need to clean up the smd pads appropriately, and I would check voltages on the pads before you solder a new part down.
Good luck,
cheers,
Richard

SSM2211 audio power amplifier is made by Analog Devices.